Improved ratchet-drill



UNITED STATES PATENT OFFICE.

HENRY GETTY, OF BROOKLYN, NEW YORK.

IMPROVED RATCHET-DRILL.

Speeilication forming part of ALetters Patent No. 43,1 09, dated June14, 1864.

To LZZ whom it may concern:

Be it known that I, HENRY GETTY, ofthe city of Brooklyn, county ofKings, and State of New York, have invented, made, and applied to usecertain new and useful Improvements in the Construction and Operation ofRatchet-Drills 5 and `I do hereby declare the following to be a full,clear, and correct description of the same, reference being had to theaccompanying drawings, making apart of this specification, and to theletters of reference marked thereon, in which- Figure l is a perspectiveView of my improved drill, with the extendingscrew at its lowest point,Fig. 2, a longitudinal vertical section of the same, with theextending-screw at its highest point; Fig. 3, an enlarged in vertedcross-section of the same at the line x Fig. 2,4 with the part B andhandle D removed to show the construction of the eccentric slides E E;Fig. 4, the same as Fig. 3, with the handle D on, to show the formationof the handle and the operation of the clutch.

Like parts of theinvention are designated by the same letters ofreference in the drawings.,

All the ratchet-drills with which I am acquainted labor under thefollowing disadvantages First, when the workman is feeding out theextending-screw, he is liable to feed it so far as to allow it to comeloose from the body ot' the drill, and thereby break it; second, thefeeding-screw is generally unprotected, or if protected it is done insuch a way as to add greatly to the expense of the drill; third, if afriction-clutch is used, it is generally costly, and is also exposed sothat chips and dirt get into it and destroy its usefulness.

I have endeavored in my improved drill to overcome these difficulties.

The nature of my invention therefore consists in a new and improved modeof construetin g the body of aAratchet-drill, as hereinafter fullyshown, with an interior ring or flange at the top for the purpose ofguiding and stead yin g the extendingscrew, and also to prevent saidscrew from coming loose from the body of the drill, and in a new andrelia ble mode of protecting the screw from all eX- ternal injurywithout adding anything to the expense, and in holding the screw firmlyand without shake in any desired position also, in providing its upperend with a recess to allow a clearance for a tap 5 also, in a new andimproved mode of constructing the extending-screw, and in a new, cheap,and durable clutch for the operation of the drill.v

To enablethose skilled in the arts to make and use my invention, I willnow proceed to describe the construction and operation of the same.

A, Figs. l and 2, shows the body of my im proved drill. It is formed ofmalleable, cast, or wrought iron, o r other suitable material. It isprovided at the top with an interior projecting ring or iange, c, boredout to fit the plain cylindrical part of the extending-screw C, for thepurpose of guiding and steadying said screw, and also to prevent saidscrew from coming loose from the body of the drill A. It is alsoprovided with a recess, I, Fig. 2, which forms a clearance for aplugtap, thus allowing the tap to cut a full thread up to the bottom ofsaid recess, without having the tap come in contact with the interiorring or iiange, c. Itis also provided at it slower part with a shoulder,H, Fig. 2, for the purpose of holding the handle D and slidingeccentrics E E in their proper positions. or screwed in the inside fromthe lower end of recess I to its lower extremity, for the purpose ofreceiving the extending-screw G, and also to allow the part B, Fig. 2,to be rmly connected with it.

B, Fig. 2, is the lower part of the drill. It is made of the samematerial as A, and is provided with a male screw, Z1, to connect it tothe part A. It is also provided with a shoulder the same as H on thebody A, and for the same purpose, and has a taper hole made for thereception of the square of the operating-drill.

G, Figs. l and 2, is the extending-screw for feeding the drill as thework progresses. 1t is made of a piece of the best steel. One end iswhat is called upset to make it large enough to cut on it the male screwG, Fig. 2, which screw is then cut on it to fit the female screw of thebody A. This screw G only extendsfrom the bottom of O about one inch,and the rest of U is made truly cylindrical and plain to fit the. holemade in the top of A. A conical point is formed on its upper end. Asmall hole is drilled across it near the top, to

It is tapped insert a lever to unscrew it by when in use. It is thenhardened and tempered at the cone, and it is completed.

D, Figs. l, 2, and .4, is the handle, made of malleable, cast, orwroughtiron, or other suitable material. l t has a hole made largeenough to allow it to go on the body A, below the shoulder H, and hasformed in its interior two recesses with two eccentric curves inopposite directions, into which recesses the sliding eccentrics E E areaccurately fitted, as shown very clearly in Fig. 4. The ends ot theserecesses form two lips or projections, F F, the use of which will beexplained hereinafter.

E E, Figs. 3 and 4, are two eccentric sliders. Their form is veryclearly shown in Fig. 3. They are truly turned in the inside to tit thebod yA, underneath the shoulder H, in an annular recess made for thatpurpose, and their exterior surfaces are formed in two ecccn tric curvesin opposite directions, to iit into the recesses in handle D, as shownin Fig. 4.

The parts having been constructed as dcscribed, the extending-screw C isinserted in the body A from below. The sliders are then put on A belowthe shoulder H. The handle D is then put on over the sliders E E, andpart B is firmly screwed into A, Which holds all the parts in theirproper positions. The operating-drill is inserted in B, and the drill isready for use.

I shall now proceed to describe the operation of the same. Theextendingscrew C is worked in the usual manner, and fed out as thedrilling progresses until thepart Greaches the interior ring or tlange,a, in the upper part of A. It cannot go any farther, and yet i held veryrmly, because the interior ring or liange, through which it passes, willnot permit the screwed part G to come loose from the part A, as shownvery clearly in Fig. 2. When the handle D is turned to the right, withthe drill in an upright position, as in Fig. 2, the projecting lips ofthe handle F F, Fig. 4, strike the broad ends of the sliders E E andcarry them round with them. When moved in this direction, they produceno effect on the body of the drill. They are shown in this position bythe black lines in Fig. 4. But when the handle is moved toward the left,With the' drill in the same position, the eccentric interior surfacesofthe recesses bind on the eccentric sliders E E, which are therebyfirmly pressed against the body A, and the whole is then carried roundtoward the left. This position is clearly shown in Fig. 4 by the redlilies. By reversing these positions alternately the operations arerepeated, and the work is drilled.

' Having thus fully described the construct-ionand operation of myimproved drill, what I claim as my invention, and desi-re to secure byLetters Patent, is-

l. The body A, with its interior ring or flange, a, and recess I, forthe purposes described.

2. The screw C, constructed as shown, for` the purposes specified.

3. The handle D, With its curved recesses and projections or lips F F,substantially as described, for the purposes specified.

4. The eccentric sliders E E, constructed as shown, for the purposesspecified.

HENRY GETTY.

Witnesses F. G. GREEN, FRANK G. FAULKNER.

